IBAN Validator
Check whether an IBAN passes the official mod-97 checksum and see it neatly formatted. Runs entirely in your browser.
How it works
- 1
Type or paste the IBAN
Spaces are ignored.
- 2
See if it is valid
The ISO 13616 mod-97 check is applied.
- 3
Read the formatted IBAN
Grouped in fours, with the country code shown.
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Frequently asked questions
No, it only means the IBAN is well-formed.
How IBAN validation works
An IBAN starts with a two-letter country code and two check digits, followed by the national account number. To validate it, the first four characters are moved to the end, letters are converted to numbers (A=10 … Z=35), and the resulting number must leave a remainder of 1 when divided by 97.
This catches typing errors before a payment is sent. It does not confirm that the account exists or belongs to the person you expect.